Convert //cc from scoped_ptr to std::unique_ptr.

cc/playback/discardable_image_map_unittest.cc

Index: cc/playback/discardable_image_map_unittest.cc
diff --git a/cc/playback/discardable_image_map_unittest.cc b/cc/playback/discardable_image_map_unittest.cc
index 95c23a3b702ed2380ffcf7131b483aa6648f7267..c02de7dc17d076dbf411517a6a8ccdcec158798b 100644
--- a/cc/playback/discardable_image_map_unittest.cc
+++ b/cc/playback/discardable_image_map_unittest.cc
@@ -6,8 +6,9 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "cc/base/region.h"
 #include "cc/test/fake_content_layer_client.h"
@@ -338,7 +339,7 @@ TEST_F(DiscardableImageMapTest, PaintDestroyedWhileImageIsDrawn) {
     DiscardableImageMap::ScopedMetadataGenerator generator(&image_map,
                                                            visible_rect.size());
     {
-      scoped_ptr<SkPaint> paint(new SkPaint());
+      std::unique_ptr<SkPaint> paint(new SkPaint());
       generator.canvas()->saveLayer(gfx::RectToSkRect(visible_rect),
                                     paint.get());
     }